Table Of Contents - Bosch BGH96 Troubleshooting Manual

Troubleshooting Guide

Table of Contents

1 Key to Symbols and Safety Instructions
1.1 Key to Symbols
1.2 Safety
2 Troubleshooting
2.1 Electrostatic Discharge (ESD) Precautions
2.2 Resetting From Lockout
3 Error Flash Codes
3.1 No Flash and No Fan (System Does Not Start Normally)
3.2 7 Flashes (System Lock-Out due to Failed Ignition)
8 Flashes (System Lock-Out due to too Many Flame Dropouts)
3.3 2 Flashes (Low Fire Pressure Switch Stuck Closed)
3.4 3 Flashes (Low Pressure Switch Stuck Open)
6 Flashes (Pressure Switch Cycle Lockout)
13 Flashes (High Pressure Switch Stuck Open)
3.5 4 Flashes (Limit/Rollout Switch Open Less than 5 Mins)
5 Flashes (Limit/Rollout Switch Open More than 15 Mins)
11 Flashes (Limit/Rollout Switch Open from 5 to 15 Mins)
3.6 9 Flashes (Incorrect Polarity of L1/L2)
3.7 Rapid Flashes (Low Flame)
Appendix A - Sequence of Operation
Two Stage Controller Logic
A1 Heating Modes
A1.1 Low Fire Heating Mode Logic (only W1 signal):
A1.2 High Fire Heating Mode Logic (W1+W2 Signal):
A2 Ignition Failure and Reignition Sequence
BTC 770502101 A | 01.2019
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Bosch 96% AFUE Gas Furnace | 3
Data subject to change